Interest Calculator
Calculate simple or compound interest in seconds — enter the principal, rate and time to see the interest and total amount.
Interest: ₹40,000
Total amount (principal + interest): ₹1,40,000
Calculate interest in 3 simple steps
Choose the mode
Pick simple interest or compound interest, depending on what you need.
Enter your numbers
Type the principal, the annual rate and the time period in years.
See interest & total
Instantly view the interest earned (or owed) and the final maturity amount.
Why use this interest calculator
Simple & compound
Switch between both methods to see how much faster compounding grows money.
Any compounding
Choose yearly, half-yearly, quarterly or monthly compounding for accuracy.
FDs, savings & loans
Plan fixed deposits, savings growth, recurring loans or solve exam maths.
Instant & accurate
Uses the standard interest formulas — results update the moment you type.
100% private
Your figures stay on your device; nothing is uploaded or stored.
Free & unlimited
No sign-up, no limits — run as many calculations as you like.
Simple and compound interest, instantly
Interest is the cost of borrowing — or the reward for saving. Simple interest is calculated only on the original principal, while compound interest is calculated on the principal plus the interest already earned, so it grows faster over time. This tool handles both: switch the mode, enter your numbers, and choose how often interest compounds.
It is handy for fixed deposits, savings, recurring loans and exam maths problems alike. Everything is calculated locally in your browser.